EP1160481A1 - Process for producing friction material and friction material obtained by the process - Google Patents

Process for producing friction material and friction material obtained by the process Download PDF

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Publication number
EP1160481A1
EP1160481A1 EP01113394A EP01113394A EP1160481A1 EP 1160481 A1 EP1160481 A1 EP 1160481A1 EP 01113394 A EP01113394 A EP 01113394A EP 01113394 A EP01113394 A EP 01113394A EP 1160481 A1 EP1160481 A1 EP 1160481A1
Authority
EP
European Patent Office
Prior art keywords
friction material
temperature
raw materials
producing
mixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01113394A
Other languages
German (de)
English (en)
French (fr)
Inventor
Takeshi c/o Tatebayashi Plant Yamane
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nisshinbo Holdings Inc
Original Assignee
Nisshinbo Industries Inc
Nisshin Spinning Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nisshinbo Industries Inc, Nisshin Spinning Co Ltd filed Critical Nisshinbo Industries Inc
Publication of EP1160481A1 publication Critical patent/EP1160481A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • F16D69/025—Compositions based on an organic binder
    • F16D69/026—Compositions based on an organic binder containing fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/16—Frictional elements, e.g. brake or clutch linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0023—Shaping by pressure

Definitions

  • the present invention relates to a process for producing a friction material, and, particularly to a process for producing a friction material used in, for example, brakes of trucks, cars or the like and to a friction material obtained by this process.
  • a friction material for brakes of vehicles is usually obtained by binding 5 to 20 ingredients of raw material by using a thermosetting resin.
  • An example of the process will be shown below.
  • the raw materials of the friction material are mixed by a dry mixing method.
  • the adhesion of a thermosetting resin, usually a phenol resin which is a binder for the friction material, with other raw materials is poor, giving rise to the problem that cracks and wrinkles of the friction material is caused by stress produced during molding, specifically, a reaction against pressure during molding, stress due to the gas generated when the resin is cured and stress applied to the friction material when the product is used with the result that the friction material is decreased in strength and sometimes fallen away from a back plate.
  • thermosetting resin a thermosetting resin thereby making the thermosetting resin adhere to a fiber or filler (powder) contained in the raw materials of the friction material (refer to a typical process diagram of FIG. 2).
  • a friction material using a phenol alalkyl resin mainly as the binder and obtained by the wet mixing method is disclosed in Japanese Patent Application Laid-Open (JP-A) No. 9-194602.
  • the wet mixing method including the example disclosed in the above publication uses a solvent or water, it is necessary to remove these liquids by heating under reduced pressure after they are mixed. If the raw materials are molded (pressed) without removing these liquids, a large quantity of the liquid is vaporized during molding, giving rise to the problem of the swelling and cracks of the product.
  • the conventional dry mixing method is improved for the purpose of applying it only to a process for the production of a friction plate to improve the conventional dry mixing method which has been disclosed in the publication of Japanese Patent Publication (JP-B) No. 7-116303.
  • JP-B Japanese Patent Publication
  • fluidity is imparted to a mixture (complete powder) obtained when raw materials of a friction material are mixed in a dry system to enable uniform charge of the raw materials into a metallic mold with a narrow width.
  • the raw materials are granulated and crushed while the reactivity of the resin binder is substantially kept and the obtained granular raw materials are level weighed and then preformed (refer to a typical process diagram of FIG. 3).
  • this method disclosed as an example is eventually more increased in production steps than the conventional dry mixing method and therefore is undesirable in view of production cost.
  • the present invention has been made to solve the problems which arise in the aforementioned process for producing the current friction material. It is an object of the present invention to provide a process for producing a friction material superior to those currently in use by improving the mixing step of a conventional production process using the dry mixing method without increasing the number of steps and also to provide the friction material obtained by the process.
  • a process for producing a friction material according to the present invention which is made for the purpose of solving the aforementioned problem has a structure comprising producing a friction material containing a fiber component, a binder component and a filler component from raw materials of a friction material through at least a mixing step, a molding step and a heat-treating step, wherein the mixing of the raw materials in the mixing step is carried cut by stirring and mixing the raw materials under heating in a dry system at a temperature where the binder is softened.
  • a friction material obtained by the aforementioned process according to the present invention has a structure comprising a fiber component, a binder component and a filler component wherein the raw materials are stirred and mixed under heating in a dry system at a temperature where the binder is softened.
  • the present invention may adopt a structure in which, in the mixing step, the raw materials are heated to a temperature not higher than the temperature ranging from a temperature where a reaction for curing a thermosetting resin which is the binder component does not take place to a temperature where the reaction takes place only little and not lower than the softening temperature of the resin and mixed under pressure as required.
  • the present invention may also adopt a structure in which a phenol resin having a curing reaction-initiating temperature of 130°C or more and a softening temperature of 80 to 120°C is used as the thermosetting resin.
  • the inventor of the present invention has conducted earnest studies and, as a result, succeeded in enabling the thermosetting resin to adhere to a fiber or a filler (powder) firmly by heating with stirring and mixing at an appropriate temperature and by applying pressure as required without using any solvent and water when the raw materials of a friction material are mixed to complete the present invention.
  • FIG. 1 is a typical process diagram of a process for producing a friction material according a dry mixing method
  • FIG. 2 is a typical process diagram of a process for producing a friction material according a wet mixing method
  • FIG. 3 is a typical process diagram of a process for producing a friction material in a method obtained by improving the dry mixing method shown in FIG. 1
  • Fig. 4 is a typical process diagram of a process for producing a friction material according a dry mixing method of the present invention.
  • the present invention is a process improved in the mixing step shown in the process diagram according to the conventional dry mixing method shown in the above FIG. 1.
  • the process for the production of a friction material according to the present invention comprises compounding raw materials of a friction material in the ratios to be specified and mixing the compounded raw materials by using a mixer having a blade rotating at a high speed with fibrous materials being opened in the mixing step.
  • the sufficiently blended mixture is molded by heating under pressure and thereafter subjected to after-curing depending on the requirement to obtain the friction material of the present invention containing a fiber component, a binder component and a filler component.
  • the raw materials (or a mixture obtained by mixing the compounded materials by using a mixer having a blade rotating at a high speed with fibrous materials being opened) are heated to a temperature not higher than the temperature ranging from a temperature where a reaction for curing a thermosetting resin which is the binder component does not take place to a temperature where the reaction takes place only little and not lower than the softening temperature of the thermosetting resin and mixed under pressure as required.
  • the mixing method the following method may be adopted: the raw materials are premixed by the usual dry mixing method and thereafter mixed under heating (under pressure).
  • the upper temperature limit is 130°C in the case of a phenol resin because a hexamine as a hardener starts suddenly to cure at a temperature of 130°C or more.
  • the lower temperature limit is the softening temperature of the thermosetting resin to be used.
  • the mixing temperature is about 80°C to 120°C. If the heat-cured product of a phenol resin has a softening temperature of 120°C or more, such a phenol resin is not included within the scope of the present invention.
  • a novolac type phenol resin which is cured by a hexamine is preferably used as the binder component of the friction material of the present invention.
  • phenol resin and thermosetting resins other than a phenol resin may be used as far as it can be maintained at a temperature not higher than the temperature ranging from a temperature where a reaction for curing the resin does not take place to a temperature where the reaction takes place only little and it can be softened by heating in the mixing step.
  • an aramid fiber, carbon fiber, potassium titanate fiber, metallic fiber, rock wool, ceramic fiber or the like may be used as the fiber component of the friction material of the present invention.
  • barium sulfate calcium hydroxide, mica, calcium carbonate, potassium titanate, dust, crushed tire powder, vermiculite or the like may be used.
  • a phenol resin forming a matrix is stuck fast to other fiber component and filler component to thereby improve the wettability, producing such an effect that the amount of the resin used for molding can be more decreased than in the case of using a current method.
  • the amount of the resin is desirably small because the resin impairs brake performances such as fade.
  • the strength is decreased thereby impairing the anti-wear performance and the anti-crack performance and therefore such a reduction in the amount of the resin is undesirable.
  • the friction material obtained in the process of the present invention has the effects of decreasing wear and preventing cracks of the friction material which cracks are generated by pressure and heat applied in a braking operation.
  • a straight novolac phenol resin was used in Examples 1 to 4 and Comparative Examples 1 and 2 and a homemade NBR modified straight novolac phenol resin was used in Example 5. Also, as to the mixing method, each raw material was weighed, mixed using Eirich for 5 minutes and then kneaded in a kneader under heating at 110°C for 5 minutes in Examples 1 to 5. In Comparative Examples 1 and 2, each raw material was weighed and mixed in Eirich for 5 minutes.
  • the wear shown Table 1 was evaluated in a wear test using a dynamo tester. In the test, the wear when a brake is applied 1000 times at each of temperatures 100°C, 200°C, 300°C and 400°C was examined.
  • the criteria of evaluation are as follows:
  • the friction material formed by the mixing method according to the present invention has higher crack characteristics and wear properties than that formed by conventional mixing methods.
  • the friction material of Example 4 and the friction material represented by Comparative Example 2 obtained by the conventional dry mixing method have the same percentage compositions of raw material, it is found that there is a large difference in the performance between the both due to the difference in mixing method.
  • the amount of the phenol resin contained in the friction material of Example 5 is greater than that of the friction material of Comparative Example 2. This shows that a friction material having a superior performance can be obtained according to the present invention, even if the phenol resin is used in an amount equal to or greater than in the case of the conventional dry mixing method.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP01113394A 2000-06-02 2001-06-01 Process for producing friction material and friction material obtained by the process Withdrawn EP1160481A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000166300 2000-06-02
JP2000166300 2000-06-02
JP2001152434 2001-05-22
JP2001152434A JP2002053846A (ja) 2000-06-02 2001-05-22 摩擦材の製造方法及びその方法により得られる摩擦材

Publications (1)

Publication Number Publication Date
EP1160481A1 true EP1160481A1 (en) 2001-12-05

Family

ID=26593238

Family Applications (1)

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EP01113394A Withdrawn EP1160481A1 (en) 2000-06-02 2001-06-01 Process for producing friction material and friction material obtained by the process

Country Status (4)

Country Link
US (1) US20020010230A1 (enrdf_load_stackoverflow)
EP (1) EP1160481A1 (enrdf_load_stackoverflow)
JP (1) JP2002053846A (enrdf_load_stackoverflow)
KR (1) KR20010112078A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2232167C1 (ru) * 2003-06-19 2004-07-10 Ишков Алексей Владимирович Способ изготовления фрикционного материала
EP1752681A1 (en) * 2005-08-01 2007-02-14 Nisshinbo Industries, Inc. Manufacturing method for raw friction material granulation substance and friction material with raw friction material granulation substance
KR100741621B1 (ko) * 2005-08-01 2007-07-23 닛신보세키 가부시키 가이샤 마찰재 원료 조립물의 제조방법 및 마찰재 원료 조립물을이용하여 제조된 마찰재

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040147192A1 (en) * 2003-01-24 2004-07-29 Ballard Material Products Inc. Carbon fiber friction material
KR100691221B1 (ko) * 2005-11-25 2007-03-12 한국타이어 주식회사 승용차 후륜용 브레이크 패드의 마찰재료 조성물
JP5660375B2 (ja) * 2010-12-08 2015-01-28 株式会社アドヴィックス 摩擦材の製造方法
JP5797073B2 (ja) 2011-09-26 2015-10-21 日清紡ブレーキ株式会社 摩擦材の製造方法
JP2013129801A (ja) * 2011-12-22 2013-07-04 Advics Co Ltd 摩擦材の製造方法
JP2016160299A (ja) * 2015-02-27 2016-09-05 株式会社アドヴィックス 非石綿系摩擦材

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07116303A (ja) 1993-10-25 1995-05-09 Heiwa Corp 電動入賞装置
JPH09194602A (ja) 1996-01-18 1997-07-29 Nisshinbo Ind Inc 摩擦材
EP0833072A2 (de) * 1996-09-28 1998-04-01 DRAISWERKE GmbH Verfahren und Anlage zur lösungsmittelfreien Herstellung von Agglomeraten aus harzgebundenem Feststoff
EP0959262A1 (en) * 1998-05-18 1999-11-24 Hitachi Chemical Co., Ltd. Non-asbestos disc brake pad for automobiles
EP0982513A1 (en) * 1998-08-26 2000-03-01 Nisshinbo Industries, Inc. Non-asbestos friction materials
EP1031754A1 (en) * 1999-02-22 2000-08-30 Nisshinbo Industries Inc. Non-asbestos friction materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07116303A (ja) 1993-10-25 1995-05-09 Heiwa Corp 電動入賞装置
JPH09194602A (ja) 1996-01-18 1997-07-29 Nisshinbo Ind Inc 摩擦材
EP0833072A2 (de) * 1996-09-28 1998-04-01 DRAISWERKE GmbH Verfahren und Anlage zur lösungsmittelfreien Herstellung von Agglomeraten aus harzgebundenem Feststoff
EP0959262A1 (en) * 1998-05-18 1999-11-24 Hitachi Chemical Co., Ltd. Non-asbestos disc brake pad for automobiles
EP0982513A1 (en) * 1998-08-26 2000-03-01 Nisshinbo Industries, Inc. Non-asbestos friction materials
EP1031754A1 (en) * 1999-02-22 2000-08-30 Nisshinbo Industries Inc. Non-asbestos friction materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2232167C1 (ru) * 2003-06-19 2004-07-10 Ишков Алексей Владимирович Способ изготовления фрикционного материала
EP1752681A1 (en) * 2005-08-01 2007-02-14 Nisshinbo Industries, Inc. Manufacturing method for raw friction material granulation substance and friction material with raw friction material granulation substance
KR100741621B1 (ko) * 2005-08-01 2007-07-23 닛신보세키 가부시키 가이샤 마찰재 원료 조립물의 제조방법 및 마찰재 원료 조립물을이용하여 제조된 마찰재

Also Published As

Publication number Publication date
US20020010230A1 (en) 2002-01-24
KR20010112078A (ko) 2001-12-20
JP2002053846A (ja) 2002-02-19

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